Design and research of single‐sided slotted waveguide antenna with a large beam declination

Abstract

Abstract The slot of the conventional longitudinal slot antenna is alternately opened on both sides of the broadside. A novel single‐sided slot array with a large‐declination (biased towards the load) is proposed, in which the slots are only biased to the same side of the waveguide broadside. The main beam declination of a single‐sided slot antenna is only biased towards the load direction and is only related to the broad‐side of the waveguide. To verify the theoretical analysis, a single‐sided slot array with 10‐slot was simulated, fabricated, and measured. According to the measured results, the antenna achieved a beam declination of 25° and a sidelobe level below −22 dB, which is in good agreement with the theoretical analysis. Furthermore, the main beam declination of the single‐sided slot and the traditional double‐sided slot array has been thoroughly studied and compared. When the main beam has a large declination angle (>30°) to the load, a single‐sided slot array is the only choice.

Keywords

• broadband antennas
• slot antenna arrays
• waveguide antenna arrays
• antenna radiation patterns